Draftsman&#39;s compass



March 1, 1966 v. D, Do sT wrrz 3,237,308

DRAFTSMANS COMPASS Original Filed March 1'7, 1961 2 Sheets-Sheet 1INVENTOR.

Vfryi/ D. Domsfew/fz BY MM ATTORNEY.

March 1, 1966 v. D. DORSTEWITZ 3,237,308

DRAFTSMANS COMPASS Original Filed March 17. 1961 2 Sheets-Sheet 2 25 g?x 7 L/ 7 32 40 20 QQ-Qn/ INVENTOR.

Virg H D. Dors few/f2 BYQWM ATTOE N E Y United States Patent 3,237,308DRAFTSMANS COMPASS Virgil D. Dorstewitz, Baker St., Coloma, Mich.Continuation of application Ser. No. 96,444, Mar. 17, 1961. Thisapplication Oct. 22, 1964, Ser. No. 405,815

3 Claims. (CI. 33-27) This invention relates to a draftsmans compass,and is a continuation of my copending application, Serial No. 96,444,filed March 17, 1961. The main objects of the invention are,

First, to provide a draftsmans compass which is adapted for use andmanipulation in the manner of draftsmens compasses of this general typeand one which may bequickly adjusted to permit sharpening of the lead bymeans of a mechanical sharpener and without removal of the lead from itsholder and which, after sharpening the lead, may be quickly adjusted touse or fully collapsed position.

Second, to provide a draftsmans compass having these advantages whichmay be economically produced and which is relatively compact whenadjusted to non-use position and may be quickly and easily adjusted fromuse position to lead sharpening position, and vice versa,

Third, to provide a draftsmans compass having these advantages in whichthe adjustments for use, sharpening and complete collapsing may be madeby manual manipulation merely by grasping and adjusting the parts.

Fourth, to provide a draftsmans compass having these advantages whichmay be economically produced.

Objects relating to details and economies of the invention will appearfrom the description to follow. The invention is defined and pointed outin the claims. A preferred embodiment of the invention is illustrated inthe accompanying drawing, in which:

FIG. 1 is a side elevational view of a draftsmans compass embodying myinvention in its fully collapsed or nonuse position.

FIG. 2 is a side elevational view illustrating one use position, aportion of a draftsmans board being conventionally illustrated.

FIG. 3 is a fragmentary cross-sectional view mainly in section on a linecorresponding to line 33 of FIG. 1.

FIG. 4 is an enlarged fragmentary view corresponding to FIG. 3 with theparts of the compass adjusted to one use position.

FIG. 5 is a view mainly in section on a line corresponding to line 55 ofFIG. 2, illustrating details of the mounting for the pointer.

FIG. 6 is an enlarged fragmentary view mainly in longitudinal section ona line corresponding to line 6-6 of FIG. 1, illustrating structuraldetails of the lead holder.

FIG, 7 is an enlarged cross-sectional view on a line corresponding toline 77 of FIG. 6, illustrating further details of the lead supportingmeans.

FIG. 8 is a fragmentary view partially in vertical section, illustratingthe compass with a lead holder member adjusted to sharpening positionand in operative relation to a sharpening apparatus, the sharpeningapparatus "ice illustrated being of the type of Cayo Patent 2,540,320,issued February 6, 1951.

FIG. 9 is a fragmentary sectional view corresponding to that of FIGS. 3and 4 of a modified form or embodiment of my invention in which thegaskets are omitted, this being one commercial embodiment.

The embodiment of my invention illustrated comprises a first leg member1 which is rigid from end to end thereof and has a compass pointerreceiving bore 2 in the lower end thereof adapted to fittingly receivethe pointer 3, see FIGS. 1, 2 and 5. The leg member has a lateralopening 4 which opens to the pointer receiving bore 2, see FIG. 5. Theinner end of the clamp member 5 is disposed in this opening and engagesthe pointer 2, as is illustrated, the clamp member being secured bymeans of the screw 6 disposed through an opening 7 in the leg member andhaving threaded engagement with the clutch or clamp member 5. The secondleg member 8 is of substantially less length than the leg member 1. Theleg members 1 and 8 are pivotally connected at their upper ends, theupper ends being in pivotal or swinging engagement with the pivot orbearing member 9. The leg members have inwardly facing bearings whichcoact with this pivot member, as is illustrated in FIGS. 1 and 2.

The bowed spring 10 is engaged with the outwardly facing notches 11 inthe leg members, which are disposed above the pivot 9. The fingerpieceor handle 12 projects above the spring 10. These parts 10 and 12 arecommonly grasped in the manipulation of the compass.

The leg members 1 and 8 are adjustably connected by means of the screw13 disposed therethrough below the pivot member 9 and provided with afingerpiece 14 disposed between the leg members 1 and 8, these legmembers having recesses or notches 15 on their inner sides adapted toreceive the fingerpiece 14 when the leg members are in fully closedposition as shown in FIG. 1. The adjusting screw has threaded engagementwith the pivoted threaded members 16 which are conventionally shown inFIGS. 1, 2 and 8.

As stated, the leg member 8 is shorter than the leg member 1 and isprovided at its lower end with a laterally and downwardly projectingpivot ear 17 which has oppositely projecting shoulders 18 at the innerend of the ear, as is clearly illustrated in FIGS. 1, 3 and otherfigures. The lead holder member, designated generally by the numeral 19,constitutes part of the leg member 8. It is provided with pivot ears 20which embrace or are disposed at the sides of the pivot ear 17 on thelower end of the leg member 8.

In the embodiment illustrated in FIGS. 3 and 4, friction disks 21 aredisposed between the car 17 and the pivot ears 20 of the lead holdermember of the leg 8. These friction disks are omitted as illustrated inFIG. 9. The lead holder member has angularly disposed shoulders orabutments 22 and 23 which coact with the shoulder 18 on the lower end ofthe member 8, the shoulder 23 being in engagement with the abutment 18.The lead holder member 19 is in use position as illustrated in FIG. 1,and in one drafting or use position as illustrated in FIG. 2. Theshoulder 22 is in thrust supporting engagement with the shoulder orabutment 18 when the lead holder member 19 is adjusted to sharpeningposition as illustrated in FIG. 8 while the shoulder 23 is in thrustsupporting engagement with abutment 18 when the lead holder is adjustedto drafting use position. This is an important feature of the applicantsinvention and will be further described after structural details of thepointer and lead holder member have been described.

The portion 24 of the lead holder member 19 is tubular and has athreaded portion 25 with which the inner end of the tubular lead socketmember 26 is in threaded engagement, see FIG. 6. The lead clutch member27 projects into the portion 24 of the lead holder member 19 and has asocket 28 in its inner end adapted to receive the lead 40, as isillustrated in FIG. 6, and has longitudinal slits 29 in the portionthereof below the portion 24 of the lead holder and a tapered portion 30at its lower end. The tapered portion of the member 27 is in clutchingor gripping engagement with the tapered portion 31 of the lead holder sothat the lead is clampingly secured, but it is not subjected to breakingstress. The only portion of the member 26 which engages the lead holderis the tapered lower portion. With this arrangement, the lead can bequickly and easily adjusted to compensate for wear or breakage.

It should be understood that the members 1 and 8 are commonly adjustedto and from use position by manipulation of the fingerpieee 14 of theadjusting screw 13.

In the embodiment shown in FIGS. 3 and 4 friction gaskets 21 are usedbut they are not used in the embodiment shown in FIG. 9, the ears on thelead holder member being somewhat springable to permit their beingfrictionally engaged with 17 by means of the connection for the leadholder member to the pivot ear 17. The coupling and pivot member 32 isprovided with a head at one end adapted to receive a screw driver or thelike and has a threaded bore at the other end for the clamping screw 33,which is also provided with a head adapted to receive a screw driver orthe like.

With the member 19 adjusted to bring its abutments 22 into engagementwith the abutments 18 at the inner end of the coupling ear 17, the leadholder member is supportedly positioned as illustrated in FIG. 8 and canbe inserted into a mechanical sharpener such as illustrated and whichcomprises a body portion 34 provided with a rotatable portion 35 havinga socket 36 into which the lead holder member may be inserted, theabrasive unit being illustrated at 37. The member 35 is rotated. bymeans of the inserted lead holder. The sharpening instrument illustratedis that of the Cayo Patent 2,540,320, issued February 6, 1951, which hasbeen extensively manufactured. As pointed out, this connection for thelead carrying portion of the leg 8 to the body or supporting portionpermits adjustment merely by grasping and swinging the lead carryingportion member 24 to drafting position as illustrated in FIG. 2, and tosharpening position as illustrated in FIG. 8. The leg members may beadjusted to any position from collapsed position as shown in FIG. 1 toany position of use within their scope of adjustment.

I have illustrated and described my invention in a highly practicalcommercial embodiment thereof. I have not attempted to illustrate ordescribe the various structural details which might be desirable forcompasses of particular design, as it is believed that this disclosurewill enable those skilled in the art to embody or adapt my invention asmay be desired.

Having thus described the invention, what is claimed as new and desiredto secure by Letters Patent is:

1. A draftsmans compass comprising a first leg member rigid from end toend thereof and having a compass pointer receiving bore opening at itslower end and at the outer side thereof in upwardly spaced relation toits lower end, a pointer disposed in said bore, a manually adjustablemeans for fixedly securing said pointer to said first leg member, asecond leg member of substantially less length than said first legmember, said leg members being pivotally connected at their upper ends,manually operable means for adjusting said leg members relative to eachother and for supporting them in their adjusted position, said secondleg member having an outwardly .and downwardly projecting pivot ear atits lower end, a lead holder member having laterally spaced pivot earson its upper end disposed in embracing relation to said pivot car onsaid second leg member, friction elements disposed between said pivotears on said second leg member and said lead holder member, .a pivotswingably connecting said pivot ears, said second leg member having astraight abutment spaced upwardly from said pivot and inclined upwardlyand outwardly of the axis of the second leg, said lead holding memberhaving two abutments arranged angularly over the top and downwardlyalong the inside of said pivot and alternatively engageable with saidabutment on said second leg in drafting use relation with said secondleg in generally extended relation below said second leg and inoutwardly angled projecting relation to said second leg to facilitatesharpening of a lead in said lead holder member, the friction in saidconnection for said lead holder member to said second leg member beingsuch as to hold the lead holder member in drafting use position and alsowhen adjusted to said angular position.

2. A draftsmans compass comprising a first leg member rigid from end toend thereof and having a compass pointer receiving bore opening at itslower end and at the outer side thereof in upwardly spaced relation toits lower end, a pointer disposed in said bore, a manually adjustablemeans for fixedly securing said pointer to said first leg member, asecond leg member of substantially less length than said first legmember, said leg members being pivotally connected at their upper ends,manually operable means for adjusting said leg members relative to eachother and for supporting them in their adjusted position, said secondleg member having an outwardly and downwardly projecting pivot ear atits lower end, a lead holder member having laterally spaced pivot earson its upper end disposed in embracing relation to said pivot ear onsaid second leg member, a pivot swingably connecting said pivot ears,said second leg member having an abutment inclined from a point at theinner side of said pivot upwardly and outwardly of said second leg andover said pivot, said lead holder ears having relatively angled abutmentedges inclined downwardly on the inner side of said pivot and outwardlyto the outer side of said pivot from above said pivot to alternativelyan selectively engage said abutment on said second leg to support saidlead holder member in drafting use relation to said first leg member andalso when adjusted to an outwardly projecting angular relation to saidfirst and second leg members to facilitate sharpening of a lead in saidlead holder member, the friction in said connection for said lead holdermember to said second leg member being such as to hold the lead holdermember in drafting use position and also when adjusted to said angularposition.

3. A draftsmans compass comprising a first leg member provided with anontiltable pointer at its lower end, a second leg member ofsubstantially less length than the first leg member, said leg membersbeing adjustably connected at their upper ends, a lead holder member,the lower end of said second leg member and the upper end of said leadholder member being provided with ears disposed in tongue and groove,over-lapping relation, a pivot car on one of the members lapped betweena pair of ears on the other member, and a combined pivot and clampmember for said pivot ears, said second leg member having a downwardlyand inwardly inclined linear abutment formed thereon and extending abovesaid pivot and clamp member to the inner side of the second leg memberin spaced relation to the pivot and clamp member, said lead holdermember having another abutment formed thereon and arranged in angularrelation relative to said pivot linearly and generally transversely inupwardly spaced relation to the upper side of the pivot then linearlydownwardly in spaced relation to the inner side of the pivot and inopposed coplanar relation to the first abutment and said second legmember and alternatively engageable in oscillated positions of said leadholder member with said first abutment for transversely outwardlysupporting said lead holder member in drafting position and forlongitudinally downwardly supporting said lead holder member in angularlaterally projecting relation to said second leg member to facilitatethe sharpening of a lead mounted in said lead holder member.

References Cited by the Examiner UNITED STATES PATENTS 5/1888 Bormann3330 1/1899 Downs 33149 7/1907 Mohnike 3316O 7/1909 Taylor 33l60 2/ 1913Weikel 33--27 10/1916 Peck 33150 1/1945 Hunt 3327 6/1951 Fairbanks 33-27FOREIGN PATENTS 8/1897 Germany.

15 ISSAC LISANN, Primary Examiner.

1. A DRAFTSMAN''S COMPASS COMPRISING A FIRST LEG MEMBER RIGID FROM ENDTO END THEREOF AND HAVING A COMPASS POINTER RECEIVING BORE OPENING ATITS LOWER END AND AT THE OUTER SIDE THEREOF IN UPWARDLY SPACED RELATIONTO ITS LOWER END, A POINTER DISPOSED IN SAID BORE, A MANUALLY ADJUSTABLEMEANS FOR FIXEDLY SECURING SAID POINTER TO SAID FIRST LEG MEMBER, ASECOND LEG MEMBER OF SUBSTANTIALLY LESS LENGTH THAN SAID FIRST LEGMEMBER, SAID LEG MEMBERS BEING PIVOTALLY CONNECTED AT THEIR UPPER ENDS,MANUALLY OPERABLE MEANS FOR ADJUSTING SAID LEG MEMBERS RELATIVE TO EACHOTHER AND FOR SUPPORTING THEM IN THEIR ADJUSTED POSITION, SAID SECONDLEG MEMBER HAVING AN OUTWARDLY AND DOWNWARDLY PROJECTING PIVOT EAR ATITS LOWER END, A LEAD HOLDER MEMBER HAVING LATERALLY SPACED PIVOT EARSON ITS UPPER END DISPOSED IN EMBRACING RELATION TO SAID PIVOT EAR ONSAID SECOND LEG MEMBER, FRICTION ELEMENTS DISPOSED BETWEEN SAID PIVOTEARS ON SAID SECOND LEG MEMBER AND SAID LEAD HOLDER MEMBER, A PIVOTSWINGABLY CONNECTING SAID PIVOT EARS, SAID SECOND LEG MEMBER HAVING ASTRAIGHT ABUTMENT SPACED UPWARDLY FROM SAID PIVOT AND INCLINED UPWARDLYAND OUTWARDLY OF THE AXIS OF THE SECOND LEG, SAID LEAD HOLDING MEMBERHAVING TWO ABUTMENTS ARRANGED ANGULARLY OVER THE TOP AND DOWNWARDLYALONG THE INSIDE OF SAID PIVOT AND ALTERNATIVELY ENGAGEABLE WITH SAIDABUTMENT OF SAID SECOND LEG IN DRAFTING USE RELATION WITH SAID SECONDLEG IN GENERALLY EXTENDED RELATION BELOW SAID SECOND LEG AND INOUTWARDLY ANGLED PROJECTING RELATION TO SAID SECOND LEG TO FACILITATESHARPENING OF A LEAD IN SAID LEAD HOLDER MEMBER, THE FRICTION IN SAIDCONNECTION FOR SAID LEAD HOLDER MEMBER TO SAID SECOND LEG MEMBER BEINGSUCH AS TO HOLD THE LEAD HOLDER MEMBER IN DRAFTING USE POSITION AND ALSOWHEN ADJUSTED TO SAID ANGULAR POSITION.